Bryson DeChambeau fired an opening-round 7-under 65 at Augusta National, hitting an impressive 15 of 18 greens in regulation in the process. Golf’s mad scientist’s play grabbed headlines and so too did his equipment. In place of the Ping i230 irons he had in the bag last week for LIV Golf’s Miami event, DeChambeau is gaming a prototype 5-PW set of irons from little-known direct-to-consumer manufacturer Avoda.

What is Avoda Golf?

Founded by Tom Bailey, also a Mike Schy student like Bryson DeChambeau, Avoda Golf is a direct-to-consumer golf equipment company that currently manufactures both single and variable-length irons in one model that are available for pre-order.

What irons is Bryson DeChambeau playing?

Per multiple reports, DeChambeau is playing a custom-designed set of single-length irons that incorporate bulge and roll into the face design. The two-piece 3D-printed irons were reportedly only approved for play by the USGA this week, according to Golfweek’s Adam Schupak.

Regarding the irons, DeChambeau told Golf Channel the irons’ performance on mishits was the determining factor in putting them in play this week. “When I mishit on the toe or the heel,” DeChambeau said. “It seems to fly a lot straighter for me and that’s what has allowed me to be more comfortable over the ball.”

What can we tell about the design of the clubs?

These days, it is a little hard to speculate on what is under the hood with so many hollow body irons. DeChambeau’s irons look to be hollow on the lower section as they do flare back a decent amount. That “muscle” on the back also looks to be fairly low on the iron head, but we can assume that is progressive through the set, moving up higher in the short irons.

A screw out on the toe is probably used to seal up the hollow cavity and used as a weight to dial in the swing weight of the club. From pictures, it is hard to tell but the sole looks to have a little curve from heel to toe while also having some sharper angles on them. A more boxy and sharper toe section looks to be the design that suits Bryson’s eye based on the irons he has gravitated toward recently.

What are bulge and roll, again?

Two types of curvature in a club face, traditionally incorporated only in wood design. Bulge is heel-toe curvature. Roll is crown-sole curvature. Both design elements are designed to mitigate gear effect on off-center strikes and produce shots that finish closer to the intended target line. (GolfTec has an excellent overview of bulge and roll with some handy GIFs for the visual learner)

What else is in DeChambeau’s bag?

Accompanying his traditional Sik putter, Bryson builds his set with a Ping Glide 4.0 wedges, a Krank Formula Fire driver and 5-wood, and a TaylorMade BRNR Mini Driver, all with LA Golf graphite shafts.